3M Bondo Filler Body Plastic Spreader. Can be used to properly fold body filler and hardener together to help optimize the mixing process, which can help improve the outcome of your project. Can also be used with fiberglass resins, glazes and putties. Salmon color is the ideal color that the body filler should be after properly mixing the hardener and the body filler together. Flexible, durable and easy to clean.